The Victron MultiPlus 12/800/35-16 combines a true sine wave inverter, an adaptive 4-stage battery charger, and a high-speed AC transfer switch in one compact enclosure. It suits a 12V self-build electrical system where you need dependable mains power on tap, plus a proper charger to top the battery bank back up from shore power or a generator.
The full bridge plus toroidal transformer topology has proven its reliability over many years in the field. The inverter is short-circuit proof and protected against overheating, whether from overload or high ambient temperature.
Key features

800VA (700W continuous at 25°C) pure sine wave inverter with a 1600W peak rating for high-inrush loads such as power tools, compressors and LED drivers
35A adaptive 4-stage battery charger (Bulk, Absorption, Float, Storage) plus a 1A trickle output for a separate starter battery
PowerControl and PowerAssist: set a maximum shore or generator current and the unit tops up any shortfall from the battery, so a limited AC source is never overloaded
16A high-speed AC transfer switch with UPS-grade changeover in under 20 milliseconds, so connected equipment does not drop out
Search Mode cuts no-load power draw by around 70% by switching the inverter off between load checks every two seconds
Programmable relay, factory set as an alarm relay for overheat, high ripple or low battery pre-alarm conditions
VE.Bus communication port for remote monitoring and configuration via a GX device
Can run in parallel with up to five further units, or be configured for three-phase operation

Technical specification

Battery voltage: 12V nominal (9.5-17V DC input range)
Continuous output: 800VA / 700W at 25°C (650W at 40°C, 400W at 65°C)
Peak power: 1600W
Maximum efficiency: 92%
Zero-load power draw: 7W (2W in Search Mode)
AC output: 230V, 50Hz
AC input range: 187-265VAC, 45-65Hz
Charge voltages: 14.4V absorption, 13.8V float, 13.2V storage
Maximum battery charge current: 35A, plus 1A starter battery trickle charge
Transfer switch: 16A
Communication: VE.Bus
Internal DC fuse: 125A
Operating temperature: -40°C to +65°C, fan-assisted cooling
Protection rating: IP21
Dimensions: 360 x 240 x 100mm
Weight: 6.4kg
Battery connection: screw terminals, 25mm² (4 AWG)

Comes with a 5-year manufacturer warranty as standard (extendable to 10 years). This is a buy-to-order item: once your order is placed we source it directly and ship it straight to you.